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(No Model.) 2 Sheets- Sheet 1f H. L. MILLER. LOOSE PULLEY LUBRICATOR.

No. 450,519. Patented Apr. 14,1891.

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H. L. MILLER. LOOSBPULLBY LUBRICATOR.

No. 450,519. Patented Apr.- 14, 1891.

BY m1416943 A TTUHNEY.

PATENT Crnics.

HENRY L. MILLER, 0F CHICAGO, ILLINOIS, ASSIGNCR TO HIMSELF, CHARLES B. MILLER, AND EDVARD C. MILLER, OF SAME PLACE.

LOOSE-PULLEY LUBRICATOR.

SPECIFICATION forming part of Letters Patent No. 450,519, dated April 1.4, 1891.

Application filed June 2l, 1890. Serial No.356,2l3 (No model.)

Chicago, in the county of Cook and State of Illinois, have invented certain new and use-4 ful Improvements in Vacuum Oil-Cups; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being lhad to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

This invention relates to certain improvements in loose-pulley lubricators.

As loose pulleys require a large amount of almost constant lubrication and are sometimes located in almost inaccessible places, it is the object of this invention to provide an improved lubricator for loose pulleys or other purposes exceedingly simple, cheap, and durable in construction and which can be attached to the hub of the pulley and rotate therewith and which allows a free constant iiow of the lubricant to the bearing. These objects are accomplished by and this invention consists in certain novel features of construction and in combinations of parts more fully described hereinafter, and particularly pointed out in the claims.

Referring` to the accompanying drawings, Figure 1 is an elevation, and Fig. 2 a central vertical section, of the lubricator. Fig. 3 is an elevation of a pulley with the present cup applied thereto.

The lubricator consists of the cup c, open at the large upper end or top and provided with an internal screw-thread to receive the threaded ilangeof the closure or cap l), which screws into said open end and tightly closes the same. This cap is provided with nutcor other means whereby the cap can be turned. The cup tapers downwardly and preferably has its lower small end bent laterally into a plane substantially at right angles to the longitudinal axis or length of the cup, and said end is preferablyT solid and provided with the duct d for the passage of the lubricant to the bearing, and also is externally threaded, as shown, to screw into the hub to the bearing,

and has the enlarged or angular portion e, whereby the cup can be turned by a suitable tool. Aplug or other valvefislocated in said lower end of the cup in duct d to regulate or cut olf the iiow of lubricant. An air-tube g 5'5 opens through the lower end of the cup into the duct (l at vthe base of the externallythreaded portion of said end, and extends up and through the sidewall of the cup a distance from its top and thence upwardlyin the 6o interior of the cup, with its upper open end h located just beneath the cover or closure of the cup. This tube is provided with one or more air-inlet ports'z', open to the outer atmosphere. As the oil feeds through duct Cl into the bearing, air passes through porti into tube g, and through said tube g into the cup above the lubricant therein, thereby allowing free flow of the lubricant, because the constant pressure of air above the same prevents 7o the formation of a partial vacuum; also, the air iiows from the lower end of the tube g into the inner end of duct d, thereby hastening the outdow of lubricant through said duct.

The feature of tube g is not limited t-o use with the peculiarly-shaped cup herein set forth.

Fig. 3 shows how the cup is applied to a loose pulley. The cup is screwed into the hub or boss of the pulley With its large end or mouth 8o facing in the direction of rotation of the pulley. lVhen the pulley rotates at a high rate of speed, the oil does not collect in the outer corner of the cup, as it does where the cupis straight; but by reason of centrifugal force and the peculiarshape and contour ot' the cup the oil lies against the outer curved side or bend and is guided or forced down through duct (l, so that the out-[low can be controlled by valve f. 'lhe continuous taper and the 9o fact that the outer end of the cup faces directly in the direction of movement prevents the oil collecting in the end of the cup; also, the aperture t' is in the outer side of tube g and in the direction of movement, so that air is forced therein.

It is evident that various changes might be resorted to in the form and arrangements and constructions of the parts described without departing from the spirit and scope ot' my inloo Vention; hencel do not wish to limit myself. to the exact construction herein set forth. The cup after-once being;l filled with lubricant will freely oil and lubricate any bearing without requiring attention until the lubricant is exhausted.

l. A closed luhricator-cup having the tube i with its opposite open ends opening, respectively, into the outer portion of the interior of the cup and into the oildischarge duct from raid cup and extending,Y into the outer atmosphere and provided with an air-inlet opening.

2. The bent oil-cup having the open tube extending from its outer interior through its i side wall and exteriorly et' the cup into its lower discharge end and provided with an airvent, as and for the purposes set t'orth.

t two witnesses.

HENRY L. MILLER. Witnesses:

HRAHAM L. GORDON,

ll. E. PccK. 

